Push notifications in iOS11 (Xcode 9 swift 4) - firebase

Question

How can I get push notifications on iOS11 in the background? I tried this and never succeeded.
Why when in the foreground does a notification appear while in the background it doesn't appear? Is there something missing with my source code or settings in the info.plist?
import UIKit
import UserNotifications
import FirebaseCore
import FirebaseMessaging
import FirebaseInstanceID
struct DataNotif: Codable {
var title: String?
var body: String?
private enum CodingKeys: String, CodingKey {
case title
case body
}
}
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, MessagingDelegate {
var window: UIWindow?
let gcmMessageIDKey = "gcm.message_id"
static var DEVICE_ID = String()
var msg_body = ""
var msg_title = ""
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
UIApplication.shared.statusBarStyle = .lightContent
FirebaseApp.configure()
Messaging.messaging().delegate = self
if #available(iOS 10.0, *) {
// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.current().delegate = self
let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
UNUserNotificationCenter.current().requestAuthorization(options: authOptions) { (granted, error) in
if (error != nil) {
print("I received the following error: \(error!)")
}else if (granted) {
print ("Authorization was granted!")
}else{
print ("Authorization was not granted. :(")
}
}
} else {
let settings: UIUserNotificationSettings =
UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
application.registerUserNotificationSettings(settings)
}
application.registerForRemoteNotifications()
return true
}
func connectToFcm() {
Messaging.messaging().shouldEstablishDirectChannel = true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
if let refreshedToken = InstanceID.instanceID().token() {
AppDelegate.DEVICE_ID = refreshedToken
print("*********")
print("InstanceID token: \(refreshedToken)")
print("*********")
}else{
print("Can't get token device")
}
}
func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
print("Failed to register for remote notifications with error: \(error)")
}
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
print(userInfo)
guard let data: [String: Any] = userInfo as? [String: Any] else {
return
}
let listData = data["notification"] as! String
let jsonData = listData.data(using: .utf8)
do {
let decoder = JSONDecoder()
let dataJson = try decoder.decode(DataNotif.self, from: jsonData!)
msg_body = dataJson.body!
msg_title = dataJson.title!
createNotification(title: msg_title, body: msg_body)
}catch{
print("error")
}
completionHandler(.newData)
}
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
let notification = response.notification.request.content.body
print(notification)
completionHandler()
}
// messaging
func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
if let token = InstanceID.instanceID().token() {
AppDelegate.DEVICE_ID = token
print("*********")
print("Token Instance: \(token)")
print("*********")
}
connectToFcm()
}
func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
print("Received data message: \(remoteMessage.appData)")
guard let data: [String: Any] = remoteMessage.appData as? [String: Any] else {
return
}
print(data)
let listData = data["notification"] as! String
let jsonData = listData.data(using: .utf8)
do {
let decoder = JSONDecoder()
let dataJson = try decoder.decode(DataNotif.self, from: jsonData!)
msg_body = dataJson.body!
msg_title = dataJson.title!
createNotification(title: msg_title, body: msg_body)
}catch{
print("error")
}
}
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert, .badge, .sound])
}
func applicationDidBecomeActive(_ application: UIApplication) {
UIApplication.shared.applicationIconBadgeNumber = 0
connectToFcm()
}
func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
if let vc = window?.rootViewController as? HomeController {
vc.scheduleNotification()
}
completionHandler(.newData)
}
func applicationDidEnterBackground(_ application: UIApplication) {
Messaging.messaging().shouldEstablishDirectChannel = false
print("Disconnect FCM")
}
func createNotification(title: String, body: String) {
let content = UNMutableNotificationContent()
content.title = NSString.localizedUserNotificationString(forKey: title, arguments: nil)
content.body = NSString.localizedUserNotificationString(forKey: body, arguments: nil)
content.sound = UNNotificationSound.default()
content.badge = NSNumber(integerLiteral: UIApplication.shared.applicationIconBadgeNumber + 1)
let request = UNNotificationRequest.init(identifier: title, content: content, trigger: nil)
let center = UNUserNotificationCenter.current()
center.add(request)
}
}
This sample post notification in postman